Virgo Logbook

During Tuesday maintenance, this morning:
- carried out weekly visual checks for boiler, AHU and chillers in TB and CEB
- refill of the LPG tank in Central area from 9.30 to 9.50 (UTC)
- carried out periodic check for AHU fan-motor belts state of tension and consunption (with external firm) with a short shut down of the involved machines:

AHU NEB: off at 6.47 - on 7.00 (UTC) ---> status OK
AHU WEB: off at 7.09 - on at 7.30 (UTC) ---> status OK
AHU CEB Hall: off at 7.50 - on at 8.05 (UTC) ---> status OK
AHU MC: off at 8.12-on at 8.26 ---> status OK

- Replacement of servo controls for the pre-heating and post-heating coils for the AHU DET Lab: task started at 6,30 (UTC); unfortunately, during this task, the 24 V transformer for the electrical power supply of the servocontrols inside the electrical cabinet was damaged; and it was necessary to replace it with a temporary one; this fault led to the restoration of operation of the air conditioning system at 5.30 pm (UTC), well beyond the maintenance limit.
Many Thanks to Massimo D'Andrea for providing the replacement quickly.
The new transformer will be available today and its installation, which requires a downtime of approximately 30 minutes, will be agreed based on the activity of the interferometer.